Dive Computer Maintenance Checklist: Battery, O-Rings, and Calibration
Your dive computer does life-or-death math underwater, yet most divers ignore maintenance until a low battery warning flashes during a boat briefing. In this episode, veteran diver Ray Hollister shares hard lessons from over eight thousand dives and forty-plus years of experience. He walks through exactly how to care for your computer's battery, o-rings, and sensors so you never lose a dive trip — or worse — to preventable equipment failure.
Key Takeaways
- Replace batteries before the warning light appears. That low battery alert means you're already running on fumes. Check your battery level before every trip, and if it's below thirty percent, swap it out. Think of it like your car's gas tank — you wouldn't start a road trip on empty.
- Change the battery compartment o-ring every single time you open it. O-rings are tiny rubber seals that keep water out, and they only cost a few dollars. Even if an o-ring looks fine, the act of opening and closing the compartment stresses it. A fresh o-ring takes thirty seconds to install and prevents floods that destroy expensive electronics.
- Use only the exact battery and grease the manufacturer specifies. A slightly thicker battery or the wrong type of lubricant can ruin the seal. One diver destroyed a six-hundred-dollar computer because his aftermarket battery was just a hair too thick. Spend the extra dollar for the right parts.
- Inspect o-rings under bright light and feel them for damage. Lay the o-ring on a white paper towel and look for cracks, flat spots, or grit. Then pinch it — healthy rubber feels soft and slightly sticky, while bad rubber feels hard or brittle like an old rubber band.
- Test your computer in shallow water after any battery change. Some computers lose their settings or need recalibration when power is cut. Take it to a pool or shallow dive site and confirm the depth reads correctly before trusting it on a real dive.
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